I wish I had a better answer than "I make one up as needed", but I have more of a filking ( http://en.wikipedia.org/wiki/Filk_music http://en.wikipedia.org/wiki

I wish I had a better answer than "I make one up as needed", but I have more of a filking ( http://en.wikipedia.org/wiki/Filk_music http://en.wikipedia.org/wiki/Filk_music ) background than any actual musical training.